package common;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class CharacterEncodingFilter implements Filter {

    private String charset;

    public CharacterEncodingFilter() {}

    public void destroy() {
        charset = null;
    }

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        if (request.getCharacterEncoding() == null) {
            request.setCharacterEncoding(charset);
        }
        response.setCharacterEncoding(charset);
        chain.doFilter(request, response);
    }

    public void init(FilterConfig fConfig) throws ServletException {
        charset = fConfig.getInitParameter("charset");
    }
}